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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/fastos/thread.h>
namespace vespalib {
/**
* Class to ensure that the current process finishes within a given time.
* Construct with the number of milliseconds before triggering _exit();
* destruct the ShutdownGuard object to dismiss the automatic process
* termination.
* A separate shutdown thread will perform the actual _exit() call.
**/
class ShutdownGuard : public FastOS_Runnable
{
enum { STACK_SIZE = (1u << 16) };
static uint64_t getTimeInMillis() {
struct timeval mytime;
gettimeofday(&mytime, 0);
uint64_t mult = 1000;
return (mytime.tv_sec * mult) + (mytime.tv_usec / mult);
}
FastOS_ThreadPool _pool;
volatile uint64_t _dieAtTime;
void Run(FastOS_ThreadInterface *, void *) override;
public:
/**
* Construct a shutdown guard with a given lifetime.
* @arg millis the number of milliseconds before process automatically exits
**/
ShutdownGuard(uint64_t millis);
/**
* Destructor that dismisses the guard and collects the shutdown thread.
**/
~ShutdownGuard();
};
} // namespace vespalib
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